Impact Assessment of Land Use and Land Cover Change on the Runoff Changes on the Historical Flood Events in the Laigiang River Basin of the South Central Coast Vietnam

Abstract

It is crucial for effective flood events management in a river basin that the relationship between land use, land cover (LULC) changes and peak flow. The flood in Central Vietnam got highly affected in recent decades due to several factors like deforestation, urbanization, lack of hydrometeorological stations, developmental monitoring and planning. This study quantifies the influence of LULC on the peak flow dynamics using a hydrological model, remote sensing technology in the Laigiang river basin. The responses of LULC changes on the peak flow and runoff volume were investigated using daily rainfall in December 2016 at the study area. The usage of the hydrological model defined that the changes in LULCs 2010-2020 caused momentous changes in hydrological response towards water flow. The rainy season floods in the bare land, low-density vegetation area, urban/built-up, and bare land while the normal flow gets the contribution from interflow generated from the dense forest.